Younger people who have not yet had their vaccines are driving much of the growth of the Covid epidemic in England, a study suggests. Most cases were found in five to 12-year-olds and 18 to 24-year-olds, researchers from Imperial College London discovered. They say the rollout of jabs to younger people is key to reducing further spread. The analysis, from the React-1 study, looked at the period 20 May to 7 June. But tentative signs in the latest daily data suggest growth may be beginning to slow.